不务正业的流浪少年兰伯特意外听到了邪恶的大黑龙手下魔族准备攻占阿尔特里亚大陆的情况,为了保护家乡他与魔物周旋被困,却被游侠巴尔纳救下,加入到了游侠杰兰特、阿尔杰塔(景甜 配音)的队伍中。精灵一族中的法师首领卡拉秋(夏梓桐 配音)也带着公主内尔文与弓箭手随从莉亚(徐娇 配音)前来邀请人类国王参战,面对魔物的入侵,他们和游侠队伍以及人类骑士贝斯柯德(胡歌 配音)组成了对付大黑龙的联盟。众人历经困难来到了大黑龙的巢穴,兰伯特与莉亚日久生情,但是他们却不知道杰兰特和阿尔杰塔,以及贝斯柯德各自带着不为人知的秘密…… 本片是人气网游《龙之谷》改编的动画大电影,由盛大游戏公司推出,计划是拍摄三部曲,故事的主线围绕《龙之谷》游戏前传。The land of Altera has observed an uneasy peace for years among Humans, Elves and Evil beasts who are loyal to the legendary Black Dragon. But the Black Dragon begins to stir from its hibernation, sending the Beasts marching across Altera. With a beast conquest perilously close, a small group of Humans and Elves unite to try to find a secret hidden road to the Black Dragon's cave and destroy it. But the fate of all of them may be in the hands of the young warrior Lambert, who must summon the confidence and skill to face the Black Dragon himself just when all may be lost.